1、ETSI TS I01 747 1.1.1 (2001-07) Technical Specification Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D); IP Interworking (IPI) 2 ETSI TS 101 747V1.1.1 (2001-07) Reference DTS/TETRA-03031 Keywords internet, interworking, IP, packet mode, security, TETRA ETSI 650 Route des Lucioles F-O6921 So
2、phia Antipolis Cedex - FRANCE Tel.: +33 4 92 94 42 O0 Fax: +33 4 93 65 47 16 Siret No 348 623 562 O0017 - NAF 742 C Association but non lucratif enregistre la Sous-prfecture de Grasse (06) No 7803/88 Important notice Individual copies of the present document can be downloaded from: htt!x/w.ettlsi. o
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6、 ETSI 3 ETSI TS 101 747V1.1.1 (2001-07) Contents Intellectual Property Rights 4 Foreword 4 1 2 3 3.1 3.2 3.3 4 5 5.1 5.2 5.3 5.3.1 5.3.2 5.3.3 5.4 5.4.1 5.4.2 5.5 5.5.1 5.5.2 6 6.1 6.2 6.3 6.4 6.5 Scope 5 References 5 Definitions, symbols and abbreviations . 6 Definitions 6 Symbols 6 Abbreviations 6
7、 Introduction 7 IPI Concept . 8 IPI Reference model 8 Transmission plane 9 GTP Signalling plane 9 SwMI - GGSN and SwMI - SwMI, Gn . 9 Between IP Backbones, Gp 9 IMSI - ITS1 Association . 10 Mobility management 10 PDP Context Mobility 10 Access Point Name (APN) . 10 Definition of APN 10 APN selection
8、 11 Security issues 11 User Mobility . 10 MS Authentication 11 Air-Interface Encryption 11 IP User Authentication 11 End-to-end Security . 11 Gp Interface Between IP Backbones 11 Annex A (informative): Use Cases 12 A . 1 Migrated to visited SwMI and activating a new PDP Context 12 Annex B (normative
9、): Additions and extensions to IS1 . 16 History 17 . ETSI 4 ETSI TS 101 747V1.1.1 (2001-07) Intellectual Property Rights IPRs essential or potentially essential to the present document may have been declared to ETSI. The information pertaining to these essential IPRs, if any, is publicly available f
10、or ETSI members and non-members, and can be found in ETSI SR O00 3 14: “Intellectual Property Rights (IPRs); Essential, orpotentially Essential, IPRs notjed to ETSI in respect OfETSIstandards“, which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web server (htt:/!w
11、vw.etsi ordj r). Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee can be given as to the existence of other IPRs not referenced in ETSI SR O00 3 14 (or the updates on the ETSI Web server) which are, or may be, or may become, essent
12、ial to the present document. Foreword This Technical Specification (TS) has been produced by ETSI Project Terrestrial Trunked Radio (TETRA). ETSI 5 ETSI TS 101 747V1.1.1 (2001-07) 1 Scope The present document defines IP Interworking (IPI) between two TETRA networks for the transfer of IP data while
13、MS migrates from one SwMI to another. The present document defines the use of GPRS Tunnelling Protocol (GTP), the Gateway GPRS Support Node (GGSN) and IS1 for IPI. The present document proposes limited extension to SNDCP of the TETRA Air Interface and IS1 in order to use the IP interworking function
14、ality of the GGSN and to use standardized Gn and Gp interfaces. As a consequence, the protocols and signalling messages already defined and developed for GPRS can be used. The use of standard GGSN and other GPRS Backbone elements and the existing interworking functions is described for IPI. The arch
15、itecture ensures re-use of the already standardized TETRA IS1 Mobility Management, HDB and VDB functions and TETRA registration procedures between the Mobile Station and SwMI. 2 Re fe re nces The following documents contain provisions which, through reference in this text, constitute provisions of t
16、he present document. References are either specific (identified by date of publication andor edition number or version number) or non-specific. For a specific reference, subsequent revisions do not apply. For a non-specific reference, the latest version applies. il ETSI EN 300 392-2 (V2.3.2): “Terre
17、strial Trunked Radio (TETRA); Voice plus Data (V+D); Part 2: Air Interface (AI)“. ETSI ETS 300 392-3-1: “Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D); Part 3: Interworking at the Inter-System Interface (ISI); Sub-part 1: General design“. ETSI ETS 300 392-3-5: “Terrestrial Trunked Radio (
18、TETRA); Voice plus Data (V+D); Part 3: Interworking at the Inter-System Interface (ISI); Sub-part 5: Additional Network Feature for Mobility Management (ANF-ISIMM)“. ETSI EN 300 927: “Digital cellular telecommunications system (Phase 2+) (GSM); Numbering, addressing and identification (GSM 03.03 ver
19、sion 5.4.1 Release 1996)“. ETSI EN 30 1 344: “Digital cellular telecommunications system (Phase 2+) (GSM); General Packet Radio Service (GPRS); Service description; Stage 2 (GSM 03.60 version 7.4.1 Release 1 99 8)“. Pl 31 41 51 61 ETSI EN 30 1 347: “Digital cellular telecommunications system (Phase
20、2+) (GSM); General Packet Radio Service (GPRS); GPRS Tunnelling Protocol (GTP) across the Gn and Gp Interface (GSM 09.60 version 7.5.1 Release 1998)“. ETSI TS 101 348: “Digital cellular telecommunications system (Phase 2+) (GSM); General Packet Radio Service (GPRS); Interworking between the Public L
21、and Mobile Network (PLMN) supporting GPRS and Packet Data Networks (PDN) (GSM 09.61 version 7.2.0 Release 1998)“. STD 6, RFC 768: “User Datagram Protocol“. RFC 1334: “PPP Authentication Protocols“. Obsoleted by RFC 1994. RFC 1994: “PPP Challenge Handshake Authentication Protocol (CHAP)“. Obsoletes R
22、FC 1334 (except for PAP). RFC 2138: “Remote Authentication Dial In User Service (RADIUS)“. Obsoletes RFC 2058. 71 SI 91 lo1 111 ETSI 6 ETSI TS 101 747V1.1.1 (2001-07) WI RFC 2 18 1 : “Clarifications to the DNS Specification“. Updates RFC 1034, RFC 1035, RFC 1 123. 3 3.1 Definitions, symbols and abbr
23、eviations Defi nit ions For the purposes of the present document, the following terms and definitions apply: IP address: Internet Protocol address, either version 4 or version 6 IP Backbone: private IP network interconnecting IP network nodes, such as GGSN and BG PDP context: unique relation between
24、 upper protocol layer address (e.g. IP address), user identity and NSAPI in SwMI, MS and GGSN TETRA Network: network consisting of a TETRA SwMI and an IP Backbone which are connected together and controlled by one and the same operator TETRA PDP: TETRA Packet Data Protocol NOTE: In addition to its l
25、iteral meaning the term has also a more generic interpretation such as TETRA PDP service or TETRA packet data service. 3.2 Symbols For the purposes of the present document, the following symbols apply: Gi Gn GP interface between IP backbones RO R1 reference point between an IP Backbone and an extern
26、al IP PDN interface between SwMI and GGSN within the same TETRA Network reference point at the TETRA Air Interface for IP packet data TETRA reference point between a packet mode TE and an MT 3.3 Ab brevi at ions For the purposes of the present document, the following abbreviations apply: AI- 1 APN B
27、G CHAP DHCP DNS GGSN GPRS GSM GTP HDB IP IPCP IPI IPSEC IS1 ISIMM ISP ITS1 L1 L2 LCP Air Interface layer one Access Point Name Border Gateway Challenge Handshake Authentication Protocol Dynamic Host Configuration Protocol Domain Name System Gateway GPRS Support Node General Packet Radio Service Glob
28、al System for Mobile communication GPRS Tunnelling Protocol Home DataBase Internet Protocol IP Control Protocol IP Interworking IP SECurity architecture Inter System Interface IS1 Mobility Management Internet Service Provider Individual TETRA Subscriber Identity Layer one Layer two Link Control Prot
29、ocol ETSI 7 ETSI TS 101 747V1.1.1 (2001-07) MAC MM MS MT NSAPI PAP PDN PDP PDU QOS RADIUS RFC SGSN SNDCP SwMI TCP TE TID UDP VDB VPN Medium Access Control Mobility Management Mobile Station Mobile Terminated Network layer Service Access Point Identity Password Authentication Protocol Packet Data Net
30、work Packet Data Protocol Protocol Data Unit Quality of Service Remote Access Dial-In User Service Request For Comment Serving GPRS Support Node SubNetwork Dependent Convergence Protocol (NL) Switching and Management Infrastructure Transmission Control Protocol Terminal Equipment Tunnel IDentifier U
31、ser Datagram Protocol Visitor Data Base Virtual Private Network 4 Introduction The TETRA Packet Data Protocol (PDP) extends TETRA to act as an IP subnet. The working of the TETRA PDP at the Air Interface is defined in EN 300 392-2 i. The present document describes the use of GPRS Tunnelling Protocol
32、 (GTP) defined in EN 301 347 6 for IPI by mandating the functionality of the Gateway GPRS Support Node (GGSN) within the TETRA network. In GPRS strict separation between the radio subsystem and network subsystem is maintained, allowing the network subsystem to be reused with other radio access techn
33、ologies, in this case by using TETRA PDP as an alternative to the GPRS radio part. The GGSN provides interworking with external packet data networks and it is connected by GTP to the TETRA SwMI. When an MS migrates from one TETRA network to another the GGSN acts as an anchor for IP traffic keeping o
34、pen PDP contexts active. This ensures socket continuity required for IP applications (IP addresses and port numbers at both ends of a TCP or UDP connection remain the same). GTP is used to tunnel GTP PDUs between SwMI and GGSN and between IP Backbones. ETSI 8 ETSI TS 101 747V1.1.1 (2001-07) Gi 5 IPI
35、 Concept Inter-Network Backbone yz? . Gp . Gi 5.1 IPI Reference model In figure 1 is illustrated the reference model of IPI. In the model the IS1 is used for MM between SwMIs and the Gp interface is used for tunnelling and routing IP datagrams between IP Backbones. The internal structure of the SwMI
36、s shown in figure 1 is an implementation option and does not set any requirements. R1 BG: Border Gateway GGSN: Gateway GPRS Support Node defined in EN 301 344 5 Gi: The reference point between an IP Backbone and an external IP PDN, TS 101 348 /1 defines the interworking with IP networks Gn: Optional
37、 interface between SwMI and GGSN within the same TETRA Network Gp: The interface between IP Backbones HDB: A database that comprises information about subscribers and is located in the subscribers home SwMI Host: An IP host computer, such as an e-mail server or an ordinary PC IP Backbone: A private
38、IP network interconnecting IP network nodes, such as GGSN and BG IP PDN: An IP Packet Data Network, such as the Internet or a private intranet ISI: Inter-System Interface for interconnecting TETRA SwMls MT: A TETRA Mobile Termination with IP Packet Data support RO : The reference point at the TETRA
39、Air Interface for IP packet data RI : The TETRA reference point between the packet mode TE and MT SwMI: TETRA Switching and Management Infrastructure TE: IP packet mode Terminal Equipment, such as a laptop VDB: A database that comprises temporary information about subscribers and is located in the v
40、isited SwMI Figure 1: IP Interworking between two TETRA Networks ETSI 9 Application IP ETSI TS 101 747V1.1.1 (2001-07) pplication . I IP I 5.2 Transmission plane Figure 2 illustrates the transmission plane of TETRA IPI showing protocol stacks for Gn interface. The protocol structure is a combination
41、 of transmission planes described in TETRA and GPRS specifications. The connection is done by a relay function on the SwMI, which relays PDP PDUs between the RO and Gn interfaces. If the Gn interface is not used the related protocol stacks may exist in different format or not at all. GTP UDP - IP L2
42、 L1 - - - GTP UDP IP L2 L1 - - Gn GGSN Gi MS RO SwMI TETRA GPRS Figure 2: The transmission plane of TETRA IPI 5.3 GTP Signalling plane 5.3.1 SwMI - GGSN and SwMI - SwMI, Gn Figure 3: Signalling Plane SwMI - GGSN GTP tunnels user data and signalling messages between SwMI and GGSN and between SwMI and
43、 SwMI. User Datagram Protocol (UDP) transfers signalling messages between SwMI and GGSN and between SwMI and SwMI. UDP is defined in STD 6, RFC 768 SI. 5.3.2 Between IP Backbones, Gp The Gp interface provides the functionality of the Gn interface and the security functions required for communication
44、 between IP Backbones. The signalling in the Gp interface is the same as in the Gn interface. The communication is done via Border Gateways (BG) which provide security functions. NOTE: Definition of security protocols is outside of the scope of present document. ETSI 10 ETSI TS 101 747V1.1.1 (2001-0
45、7) 5.3.3 IMSI - ITS1 Association When SwMI sends a Create PDP Context request to GGSN, IMSI is a part of TID as defined in EN 30 1 347 6. In TETRA Air Interface ITSI is used instead of IMSI and therefore the relay function between the TETRA SNDCP and GTP shall provide the support for IMSI - ITSI ass
46、ociation. 5.4 Mobil i ty management 5.4.1 User Mobility The IS1 defined in ETS 300 392-3-1 2, provides the TETRA Mobility Management between SwMIs as defined in ETS 300 392-3-5 3. The IS1 is used to transfer the IP service profile from home SwMI to visited SwMI when migration occurs. IPI sets additi
47、onal requirements for information to be included in IP service profile as defined in annex B. 5.4.2 PDP Context Mobility When a PDP context is established instances of the context shall be created in the following locations: MS; SwM1;and GGSN. To connect contexts in SwMI and GGSN a GTP tunnel shall
48、be established. Both ends of the GTP tunnel shall know the IP address of the other end of the tunnel. For GGSN this means that it knows the IP address of the Gn interface in SwMI. This address shall be stored in GGSN PDP Context in the SGSNAddress field which is defined in EN 301 344 5. When an MS m
49、igrates from one SwMI to another the GGSN acts as an anchor for IP traffic keeping open PDP contexts active. This ensures the socket continuity required for IP applications (IP addresses and port numbers at both ends of a TCP or UDP connection remain the same). The visited SwMI shall signal the corresponding GGSN to update the address of the Gn interface, i.e. the other end of the tunnel is moved from the previous visited SwMI to visited SwMI. This shall be done by using the GTP signalling message Update PDP Context Request as defined in EN 301 347 6
